Infrared camouflage coating and preparation method thereof

Abstract

The embodiment of the invention provides an infrared camouflage coating and a preparation method thereof.The preparation method comprises the steps that S1, fluorocarbon resin, pigment and a dispersing agent are pre-dispersed, and a first material is obtained; s2, carrying out a ball milling process on the first material; s3, after functional filler is infiltrated with a diluent, the functional filler is transferred into the ball-milled first material; then sequentially adding matting powder and at least one auxiliary agent to obtain a second material; the second material is dispersed; and step S4, filtering the dispersed second material to obtain the infrared camouflage coating. The preparation method of the infrared camouflage coating provided by the embodiment of the invention has the advantages of simple process and low cost, and the prepared infrared camouflage coating has excellent weather resistance and low infrared emissivity.

Description

Technical Field

[0001] The present invention relates to the technical field of coatings, and in particular, to an infrared stealth coating and a preparation method thereof. Background Art

[0002] During the operation of weapons and equipment, heat is generated, increasing the infrared radiation energy of the equipment itself. As a result, a large radiation contrast is formed with the background, increasing the probability of being detected by infrared detection equipment. Accordingly, the risks of being intercepted, struck, and destroyed are greatly increased. According to the Stefan-Boltzmann law: E = εσT 4 , (where E is the infrared radiation energy of the object; ε is the infrared emissivity of the object; σ is the Stefan-Boltzmann constant; T is the surface temperature of the object) the infrared radiation energy E of the object is proportional to the infrared emissivity ε and the fourth power of the surface temperature T of the object. To reduce the possibility of detection of the equipment being exposed, it can be achieved by reducing the infrared radiation energy E of the object. There are two specific methods: one is to reduce the surface temperature T of the object, but this method is difficult; the other is to reduce the infrared emissivity of the object, which can be achieved by coating a layer of low infrared emissivity coating on the surface of the object. The low infrared emissivity coating is also called an infrared stealth coating. Therefore, for an infrared stealth coating, the lower its infrared emissivity, the better. In addition, as a topcoat, the infrared stealth coating also needs to have excellent weather resistance.

[0003] There are very few domestic enterprises engaged in infrared stealth coatings, mainly including Sichuan Jiachi Electronic Technology Co., Ltd. and Tianjin Lighthouse Paint Industry Development Co., Ltd. In terms of weather resistance, the film-forming substances selected for the infrared stealth coatings prepared in the prior art are mostly improved from common synthetic resins on the market, and their weather resistance is inferior to that of fluorocarbon resins with excellent weather resistance. Summary of the Invention

[0004] In view of the problems in the related art, the preparation method of the infrared stealth coating proposed in the embodiment of the present invention has the advantages of simple process and low cost, and the prepared infrared stealth coating has excellent weather resistance and low infrared emissivity.

[0005] An embodiment of the present invention provides a preparation method of an infrared stealth coating, which includes:

[0006] Step S1: Pre-disperse fluorocarbon resin, pigment, and dispersant to obtain a first material;

[0007] Step S2: Perform a ball milling process on the first material;

[0008] Step S3: After infiltrating the functional filler with a diluent, transfer it into the ball-milled first material; then sequentially add matting powder and at least one auxiliary agent to obtain a second material; disperse the second material.

[0009] Step S4: Filter the dispersed second material to obtain the infrared stealth coating.

[0010] Preferably, in step S3, the functional filler is aluminum powder and / or aluminum paste.

[0011] Preferably, by mass, the fluorocarbon resin in step S1 is 60-100 parts, the pigment is 4.5-17 parts, and the dispersant is 1-4 parts; specifically, the pigment includes 2-7 parts of carbon black, 2-7 parts of cyan blue, and 0.5-3 parts of red, or the pigment includes 2-8 parts of carbon black and 2.5-9 parts of cyan blue.

[0012] Preferably, by mass, the functional filler in step S3 is 15-40 parts, the diluent is 50-120 parts, the matting powder is 0.1-1.5 parts, the hardening and wear-resistant agent is 0.1-3.5 parts, the non-silicon leveling agent is 0.1-4 parts, the adhesion promoter is 0.5-6 parts, and the curing agent is 3-16 parts.

[0013] Preferably, the dispersant is BYK-163 or BYK-P104S of BYK Chemie; the pigment includes carbon black, cyan blue or carbon black, ultramarine blue;

[0014] Or the pigment includes carbon black, cyan blue, red;

[0015] Or the pigment includes carbon black, cyan blue, iron oxide red.

[0016] Preferably, step S1 specifically includes: preliminarily dispersing the fluorocarbon resin, pigment and dispersant with a disperser at a speed of 500-1000 r / min for 15-30 min to obtain a first material;

[0017] Step S4 specifically includes: filtering the dispersed second material with a 300-500 mesh screen to obtain the infrared stealth coating.

[0018] Preferably, step S2 specifically includes performing a ball milling process on the first material in a ball milling tank; the ball milling tank includes steel balls; and filtering out the steel balls after ball milling so that the ball-milled first material does not contain steel balls; wherein, the mass ratio of the steel balls to the first material is 1:1-2.5:1; the rotation speed of the ball milling tank is 400-800 r / min, and the ball milling time is 1.5-3.5 h; preferably, the rotation speed of the ball milling tank is 600-800 r / min, and the ball milling time is 2-2.5 h.

[0019] Preferably, the soaking time of the functional filler in step S3 is 15 - 30 min, and preferably, the soaking time of the functional filler is 20 - 30 min; the dispersion of the second material in step S3 specifically includes: dispersing the second material with a high-speed disperser at a speed of 1000 - 1500 r / min for 15 - 60 min.

[0020] Preferably, the matting powder is ultrafine silica, wax-treated silica or ultrafine talc powder; the diluent is at least one of xylene, butyl acetate, and dibasic acid ester.

[0021] Another embodiment of the present invention provides an infrared stealth coating, which is prepared by using the preparation method of the infrared stealth coating described above.

[0022] The beneficial effects of the present invention are as follows:

[0023] The preparation method of the infrared stealth coating provided by the embodiment of the present invention endows the infrared stealth coating with excellent weather resistance by selecting materials such as resins, functional fillers, and pigments with excellent weather resistance; the selected functional filler and resin in the preparation method have good compatibility, endowing the infrared stealth coating with a low infrared emissivity. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a process flow diagram of the preparation method of the infrared stealth coating provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0027] As Figure 1 shown, the preparation method of the infrared stealth coating according to the embodiment of the present invention includes:

[0028] Step S1: Predispersing a fluorocarbon resin, a pigment, and a dispersant to obtain a first material;

[0029] Step S2: Performing a ball milling process on the first material;

[0030] Step S3: After infiltrating the functional filler with a diluent, transfer it into the first material after ball milling; then sequentially add the matting powder and at least one auxiliary agent to obtain a second material; disperse the second material.

[0031] Step S4: Filter the dispersed second material to obtain the infrared stealth coating.

[0032] Specifically, in the embodiment of the present invention, in Step S3, the functional filler is aluminum powder and / or aluminum silver paste.

[0033] In the embodiment of the present invention, by mass, the fluorocarbon resin in Step S1 is 60 - 100 parts, the pigment is 4.5 - 17 parts, and the dispersant is 1 - 4 parts; specifically, the pigment includes 2 - 7 parts of carbon black, 2 - 7 parts of cyan blue, and 0.5 - 3 parts of scarlet red, or the pigment includes 2 - 8 parts of carbon black and 2.5 - 9 parts of cyan blue.

[0034] In the embodiment of the present invention, by mass, the functional filler in Step S3 is 15 - 40 parts, the diluent is 50 - 120 parts, the matting powder is 0.1 - 1.5 parts, the hardening and wear-resistant agent is 0.1 - 3.5 parts, the non-silicon leveling agent is 0.1 - 4 parts, the adhesion promoter is 0.5 - 6 parts, and the curing agent is 3 - 16 parts.

[0035] In the embodiment of the present invention, the dispersant is BYK-163 or BYK-P104S of BYK Chemie; the pigment includes carbon black, cyan blue or carbon black, ultramarine blue;

[0036] Or the pigment includes carbon black, cyan blue, scarlet red;

[0037] Or the pigment includes carbon black, cyan blue, iron oxide red.

[0038] In the embodiment of the present invention, Step S1 specifically includes: predispersing the fluorocarbon resin, pigment, and dispersant with a dispersing machine at a speed of 500 - 1000 r / min for 15 - 30 min to obtain a first material;

[0039] Step S4 specifically includes: filtering the dispersed second material with a 300 - 500 mesh screen to obtain the infrared stealth coating.

[0040] In an embodiment of the present invention, step S2 specifically includes performing a ball milling process on the first material in a ball milling tank; the ball milling tank contains steel balls; and after ball milling, the steel balls are filtered out so that the first material after ball milling does not contain steel balls; wherein, the mass ratio of the steel balls to the first material is 1:1 to 2.5:1; the rotation speed of the ball milling tank is 400 to 800 r / min, and the ball milling time is 1.5 to 3.5 h; preferably, the rotation speed of the ball milling tank is 600 to 800 r / min, and the ball milling time is 2 to 2.5 h.

[0041] In an embodiment of the present invention, the wetting time of the functional filler in step S3 is 15 to 30 min, preferably, the wetting time of the functional filler is 20 to 30 min; the dispersion of the second material in step S3 specifically includes: dispersing the second material with a high-speed disperser at a speed of 1000 to 1500 r / min for 15 to 60 min.

[0042] In an embodiment of the present invention, the matting agent is ultrafine silica, wax-treated silica or ultrafine talc powder; the diluent is at least one of xylene, butyl acetate, and dibasic acid ester.

[0043] As a non-limiting illustration, the dispersant is a polymer-type block copolymer containing a pigmentophilic group or a solution of a polycarboxylic acid polymer and a polysiloxane copolymer. More specifically, as a non-limiting illustration, the dispersant is BYK-163 or BYK-P104S of BYK Chemie.

[0044] The hardening and wear-resistant agent is one or more of a polysiloxane copolymer, a polyether-modified organosilicon compound, or an alkyl-modified siloxane polymer.

[0045] The non-silicon leveling agent is an acrylate copolymer or a fluorinated acrylate copolymer solution.

[0046] The adhesion promoter is a special polyester compound or a polymeric silane coupling agent.

[0047] The curing agent is a polyisocyanate.

[0048] Another embodiment of the present invention provides an infrared stealth coating, which is prepared by using the preparation method of the infrared stealth coating described above.

[0049] The preparation method of the infrared stealth coating proposed by the embodiment of the present invention has the advantages of simple process and low cost, and the obtained infrared stealth coating has excellent weather resistance and low infrared emissivity.

[0050] The preparation method of the infrared stealth coating provided by the embodiment of the present invention endows the infrared stealth coating with excellent weather resistance by selecting materials such as resins, functional fillers, and pigments with excellent weather resistance; the selected functional fillers and resins in the preparation method have good compatibility, endowing the infrared stealth coating with a low infrared emissivity.

[0051] Example 1

[0052] A preparation method of an infrared stealth coating includes the following steps:

[0053] (1) By mass, 2 - 7 parts of carbon black, 2 - 7 parts of cyan blue, 0.5 - 3 parts of positive red paste, 60 - 100 parts of fluorocarbon resin, and 1 - 4 parts of dispersant are weighed into a dispersion tank, and pre-dispersed at a speed of 500 - 1000 r / min for 15 min by a disperser to prepare a first material.

[0054] (2) Transfer the above first material into a ball mill tank of a ball mill that has been filled with an appropriate amount of steel balls, tighten and seal the ball mill tank, and grind at a ball mill speed of 400 r / min for 2 h; the mass ratio of the steel balls to the first material is 1:1 - 2.5:1.

[0055] (3) Wait for the ball mill tank to cool naturally to room temperature, loosen and unseal the ball mill tank, separate the liquid material, wash the steel balls and residual materials in the ball mill tank with an appropriate amount of diluent, and filter and separate the liquid material (that is, filter out the steel balls so that the ground liquid material does not contain steel balls); the amount of diluent used is 2% - 4% of the amount of the liquid material.

[0056] (4) By mass, 15 - 40 parts of functional filler are infiltrated with 50 - 120 parts of diluent for 20 min, then transferred into the ground liquid material in step 3, and 0.1 - 1.5 parts of matting powder, 0.1 - 3.5 parts of hardening and wear-resistant agent, 0.1 - 4 parts of non-silicon leveling agent, 0.5 - 6 parts of adhesion promoter, and 3 - 16 parts of curing agent are added in sequence to obtain a second material;

[0057] The second material is dispersed at a speed of 1000 - 1500 r / min for 30 min by a high-speed disperser;

[0058] (5) Filter the second material dispersed in step 4 with a 300 - 500 mesh screen to obtain the infrared stealth coating.

[0059] Example 2

[0060] A preparation method of an infrared stealth coating includes the following steps:

[0061] (1) Weigh 2 - 7 parts by mass of carbon black, 2 - 7 parts of cyan blue, 0.5 - 3 parts of positive red paste, 60 - 100 parts of fluorocarbon resin, and 1 - 4 parts of dispersant into a dispersion tank. Use a disperser to pre - disperse at a speed of 500 - 1000 r / min for 20 min to prepare the first material.

[0062] (2) Transfer the above - mentioned first material into the ball - mill tank of a ball mill that has been filled with an appropriate amount of steel balls. Tighten and seal the ball - mill tank well, and grind at a ball - milling speed of 500 r / min for 2.5 h; the mass ratio of steel balls to the first material is 1:1 - 2.5:1.

[0063] (3) Wait for the ball - mill tank to cool naturally to room temperature. Loosen and unseal the ball - mill tank, separate the liquid material, wash the steel balls and residual material in the ball - mill tank with an appropriate amount of diluent, and filter to separate the liquid material (that is, filter out the steel balls so that the ground liquid material does not contain steel balls); the amount of diluent used is 2% - 4% of the amount of liquid material used.

[0064] (4) Weigh 15 - 40 parts of functional filler by mass, soak it with 50 - 120 parts of diluent for 25 min, then transfer it into the liquid material ground in step 3. Then, add 0.1 - 1.5 parts of matting powder, 0.1 - 3.5 parts of hardening and wear - resistant agent, 0.1 - 4 parts of non - silicon leveling agent, 0.5 - 6 parts of adhesion promoter, and 3 - 16 parts of curing agent in sequence to obtain the second material;

[0065] Disperse the second material with a high - speed disperser at a speed of 1000 - 1500 r / min for 30 min;

[0066] (5) Filter the second material dispersed in step 4 with a 300 - 500 - mesh screen to obtain the infrared stealth coating.

[0067] Example 3

[0068] A preparation method of an infrared stealth coating, comprising the following steps:

[0069] (1) Weigh 2 - 7 parts by mass of carbon black, 2 - 7 parts of cyan blue, 0.5 - 3 parts of positive red, 60 - 100 parts of fluorocarbon resin, and 1 - 4 parts of dispersant into a dispersion tank. Use a disperser to pre - disperse at a speed of 500 - 1000 r / min for 25 min to prepare the first material.

[0070] (2) Transfer the above - mentioned first material into the ball - mill tank of a ball mill that has been filled with an appropriate amount of steel balls. Tighten and seal the ball - mill tank well, and grind at a ball - milling speed of 400 r / min for 3 h; the mass ratio of steel balls to the first material is 1:1 - 2.5:1.

[0071] (3) After the ball mill has cooled naturally to room temperature, loosen and unseal the ball mill, separate the liquid feed, wash the steel balls and residual materials in the ball mill with an appropriate amount of diluent, and filter out the liquid feed (i.e., filter out the steel balls so that the liquid feed after grinding does not contain steel balls); the amount of diluent used is 2% to 4% of the liquid feed.

[0072] (4) After soaking 15 to 40 parts of functional filler with 50 to 120 parts of diluent for 30 minutes, the mixture is transferred into the milled liquid in step 3, and 0.1 to 1.5 parts of matting powder, 0.1 to 3.5 parts of hardening and wear-resistant agent, 0.1 to 4 parts of non-silicon leveling agent, 0.5 to 6 parts of adhesion promoter, and 3 to 16 parts of curing agent are added in sequence to obtain a second material;

[0073] The second material is dispersed by a high-speed disperser at a speed of 1000-1500 r / min for 30 min;

[0074] (5) Filter the second material dispersed in step 4 through a 300-500 mesh gauze to obtain the infrared stealth coating.

[0075] The infrared stealth coating described in the embodiment of the present invention optimizes the formula and preparation process by selecting weather-resistant resin and functional filler, and on the basis of good compatibility of the two, the infrared stealth coating has low infrared emissivity and excellent weather resistance; after conducting the environmental tests described below (including salt spray resistance test, heat and humidity resistance test, and artificial climate accelerated aging test), the infrared emissivity of the infrared stealth coating not only does not decrease significantly, but also the infrared stealth performance is still quite good (that is, it still has a low infrared emissivity).

[0076] The following Appendix 1 shows the infrared emissivity (8-14 μm) of the infrared stealth coatings obtained in Examples 1, 2 and 3 of the present invention before and after 2000 hours of salt spray resistance test; the conditions of the salt spray resistance test are 35±1 degrees Celsius and a 5% NaCl solution.

[0077]

[0078]

[0079] The following Appendix 2 shows the infrared emissivity (8-14 μm) of the infrared stealth coatings obtained in Examples 1, 2 and 3 of the present invention before and after 1000 hours of moisture and heat resistance test; the conditions of the moisture and heat resistance test are 47±1 degrees Celsius, RH=(94-98)%.

[0080] Example Example 1 Example 2 Example 3 Before Damp Heat Test 0.320 0.298 0.268 After Damp Heat Test 0.318 0.298 0.271

[0081] The following Table 3 shows the infrared emissivity (8 - 14μm) of the infrared stealth coatings obtained in Example 1, Example 2, and Example 3 of the present invention before and after 2000h of artificial climate accelerated aging test; the artificial climate accelerated aging test is a test that simulates natural environmental aging. The condition of the artificial climate accelerated aging test is UVA 340nm.

[0082]

[0083] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A preparation method of an infrared stealth coating, characterized in that Comprising: Step S1: Predisperse fluorocarbon resin, pigment and dispersant to obtain a first material; Step S2: Perform a ball milling process on the first material; Step S3: After infiltrating the functional filler with a diluent, transfer it into the ball-milled first material; then sequentially add matting powder and at least one auxiliary agent to obtain a second material; disperse the second material; Step S4: Filter the dispersed second material to obtain the infrared stealth coating.

2. The preparation method according to claim 1, characterized in that, In Step S3, the functional filler is aluminum powder and / or aluminum silver paste.

3. The preparation method according to claim 1, characterized in that, By mass, the fluorocarbon resin in Step S1 is 60 - 100 parts, the pigment is 4.5 - 17 parts, and the dispersant is 1 - 4 parts; specifically, the pigment includes 2 - 7 parts of carbon black, 2 - 7 parts of cyan blue, and 0.5 - 3 parts of primary red, or the pigment includes 2 - 8 parts of carbon black and 2.5 - 9 parts of cyan blue.

4. The preparation method according to claim 1, characterized in that By mass, the functional filler in Step S3 is 15 - 40 parts, the diluent is 50 - 120 parts, the matting powder is 0.1 - 1.5 parts, the hardening and wear-resistant agent is 0.1 - 3.5 parts, the non-silicon leveling agent is 0.1 - 4 parts, the adhesion promoter is 0.5 - 6 parts, and the curing agent is 3 - 16 parts.

5. The preparation method according to claim 1, characterized in that, The dispersant is BYK-163 or BYK-P104S of BYK Chemie; the pigment includes carbon black, cyan blue or carbon black, ultramarine blue; Or the pigment includes carbon black, cyan blue, primary red; Or the pigment includes carbon black, cyan blue, iron red.

6. The preparation method according to claim 1, characterized in that, Step S1 specifically includes: Predisperse fluorocarbon resin, pigment and dispersant with a disperser at a speed of 500 - 1000 r / min for 15 - 30 min to obtain a first material; Step S4 specifically includes: Filter the dispersed second material with a 300 - 500 mesh screen to obtain the infrared stealth coating.

7. The preparation method according to claim 1, characterized in that, Step S2 specifically includes performing a ball milling process on the first material in a ball milling tank; the ball milling tank includes steel balls; and filtering out the steel balls after ball milling so that the ball-milled first material does not contain steel balls; wherein, the mass ratio of the steel balls to the first material is 1:1 - 2.5:1; the rotation speed of the ball milling tank is 400 - 800 r / min, and the ball milling time is 1.5 - 3.5 h; preferably, the rotation speed of the ball milling tank is 600 - 800 r / min, and the ball milling time is 2 - 2.5 h.

8. The preparation method according to claim 1, characterized in that, The infiltration time of the functional filler in Step S3 is 15 - 30 min, preferably, the infiltration time of the functional filler is 20 - 30 min; dispersing the second material in Step S3 specifically includes: Disperse the second material with a high-speed disperser at a speed of 1000 - 1500 r / min for 15 - 60 min.

9. The preparation method according to claim 1, characterized in that, The matting powder is ultrafine silica, wax-treated silica or ultrafine talc powder; the diluent is at least one of xylene, butyl acetate, and dibasic acid ester.

10. An infrared stealth coating, characterized in that, It is prepared by using the preparation method of the infrared stealth coating according to any one of claims 1 - 9.

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